Prince Ernst II, was only son of Prince Moritz, the youngest son of Georg, Duke of Saxe-Altenburg and Princess Augusta. Ernst married Princess Adelaide, a granddaughter of Prince George William. Prince Ernst became the only former reigning prince who accepted GDR citizenship after World War II, refusing to relocate to the British occupation zone.
On 11 March 1916 in Berlin, Joachim married Princess Marie-Auguste of Anhalt (10 June 1898 – 22 May 1983), the daughter of Eduard, Duke of Anhalt and his wife Princess Luise of Saxe-Altenburg (daughter of Prince Moritz of Saxe-Altenburg). He and Marie-Auguste had been engaged since 14 October of the previous year.
Photograph credit: Harris & Ewing ; restored by Adam Cuerden
Frederick, Duke of Saxe-Altenburg: 4. Georg, Duke of Saxe-Altenburg: 9. Duchess Charlotte Georgine of Mecklenburg-Strelitz: 2. Prince Moritz of Saxe-Altenburg: 10. Frederick Louis, Hereditary Grand Duke of Mecklenburg-Schwerin: 5. Duchess Marie Louise of Mecklenburg-Schwerin: 11. Grand Duchess Elena Pavlovna of Russia: 1. Ernst II, Duke of Saxe ...
The family split into two ruling branches in 1485 when the sons of Frederick II, Elector of Saxony divided the territories hitherto ruled jointly. The elder son Ernest, who had succeeded his father as Prince-elector, received the territories assigned to the Elector (Electorate of Saxony) and Thuringia, while his younger brother Albert obtained the March of Meissen, which he ruled from Dresden.
On 13 February 1991 Georg Moritz, Hereditary Prince of Saxe-Altenburg died and with him the line of Ernest, Duke of Saxe-Hildburghausen and Saxe-Altenburg went extinct. His claim passed to Michael, Prince of Saxe-Weimar-Eisenach (b. 15 November 1946).
Between 1912 and 1913, Greece engaged in the Balkan Wars, during which Prince Andrew served under Crown Prince Constantine while Princess Alice worked as a nurse for wounded soldiers.   They were, however, especially affected by the First World War , which created division between different branches of their family  as Greece set aside its neutrality due to the Triple Entente .